Modernism and postmodernism are literary movements that experimented with form and style in response to social and historical conditions. Modernism flourished in the early 20th century as writers explored fragmented perspectives and psychological theories. Postmodernism emerged after World War II and further challenged conventions through genres like the absurd and antinovel. Theorists like Lyotard and Baudrillard analyzed how postmodernism questions metanarratives and the distinction between reality and simulations.